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• W3128297767 abstract "Explaining to users why some items are recommended is critical, as it can help users to make better decisions, increase their satisfaction, and gain their trust in recommender systems (RS). However, existing explainable RS usually consider explanation as a side output of the recommendation model, which has two problems: (1) it is difficult to evaluate the produced explanations because they are usually model-dependent, and (2) as a result, how the explanations impact the recommendation performance is less investigated. In this paper, explaining recommendations is formulated as a ranking task, and learned from data, similar to item ranking for recommendation. This makes it possible for standard evaluation of explanations via ranking metrics (e.g., NDCG). Furthermore, we extend traditional item ranking to an item-explanation joint-ranking formalization to study if purposely selecting explanations could achieve certain learning goals, e.g., improving recommendation performance. A great challenge, however, is that the sparsity issue in the user-item-explanation data would be inevitably severer than that in traditional user-item interaction data, since not every user-item pair can be associated with all explanations. To mitigate this issue, we propose to perform two sets of matrix factorization by considering the ternary relationship as two groups of binary relationships. Experiments on three large datasets verify our solution's effectiveness on both item recommendation and explanation ranking. To facilitate the development of explainable RS, we plan to make our code publicly available." @default.
• W3128297767 created "2021-02-15" @default.
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• W3128297767 date "2021-02-01" @default.
• W3128297767 modified "2023-09-27" @default.
• W3128297767 title "Learning to Explain Recommendations." @default.
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